Around 10 red barrel (oil) needed, I put one powder barrel too and some yellow barrel (vine) but they are maybe usuless.
The tips; to put them close to boss, we need to trick him (need to make him a U turn to don't get the cut scene), and to make that we need to use one character with high jumping ability and make a first jump behind him (kind of shelf) to lure him, and with another one (with high mobility), activate stealth mode and when the way is free activate turn by turn, move to place barrels, and flee. The first character jump back to not be killed, but it's up to player to make him come back ...

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